In composite fish culture, catla, rohu, and mrigal are stocked in the ratio of: (RJ AO 2014)

✅Explanation: The recommended stocking ratio for catla, rohu, and mrigal in composite fish culture is 3:3:4. This ratio is based on the different feeding habits and growth patterns of these species, ensuring optimal utilization of resources and minimizing competition.
-Catla: Surface feeder, consuming mainly phytoplankton and zooplankton.
-Rohu: Column feeder, feeding on zooplankton and detritus in the middle layer of the water.
-Mrigal: Bottom feeder, consuming mainly detritus and benthic organisms.